JPH11181767A - End metal fitting of steel pipe pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end metal fitting of a steel pipe pile which allows the steel pipe pile to easily penetrate the ground, while increasing the force to support the steel pipe pile which has penetrated the ground. SOLUTION: The short pipe 11 of an end metal fitting 1 connected to the end of a steel pipe pile 2 is equal to the steel pipe pile 2 in diameter, and one or plural excavating claws 13 projected downward from the lower end face of the short pipe 11 and projected outward from the outer periphery of the lower end are provided at least on the lower end of the short pipe 11. A middle partition plate 12 is provided in almost the middle of the inside of the short pipe 11 along the vertical direction, and one or several turns of spiral wings 14 with lower ends starting from a position almost outside the middle partition plate 12 are projected from the outer peripheral surface of the short pipe 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal fitting for a steel pipe pile which penetrates into the ground for a building and supports the building.

[0002]

2. Description of the Related Art Conventionally, a steel pipe pile disclosed in JP-A-59-109616 is known.

In this prior art invention, an excavating blade is protruded from a lower end of a pile body of a steel pipe pile, and a spiral blade is protruded from an outer peripheral surface at a predetermined distance from the lower end over one or several turns. Steel pipe pile.

[0004]

However, in the steel pipe pile according to the prior art, a bottom plate is provided at the lower end of the pile main body.
For this reason, there was a problem that initial penetration was not good. In order to solve such problems, the bottom plate is formed in an annular shape, a through hole is formed in the pile body, and the earth and sand dug by the excavating blade can escape into the pile body through this through hole as it penetrates. In order to improve the penetration of the pile body, the steel pipe pile according to the prior art has been devised. However, if the earth and sand can escape into the pile main body in this way, there is a problem that the penetrability is improved, but the supporting force is reduced.

An object of the present invention is to solve the above-mentioned problems of the conventional steel pipe pile.

[0006]

The tip fitting of the steel pipe pile according to the present invention comprises a short pipe connected to the tip of the steel pipe pile, and the short pipe has the same diameter as the steel pipe pile. One or a plurality of excavating claws projecting downward from the lower end surface and projecting outward from the lower end outer surface are provided on the lower end outer periphery of the short tube, and a partition plate is provided substantially in the middle of the short tube in the vertical direction, and the short tube is provided. The outer peripheral surface is provided with one or several turns of a spiral wing whose lower end starts from a position substantially outside the above-mentioned partition plate.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially broken side view in which a metal fitting of a steel pipe pile is connected to a tip of the steel pipe pile by welding.

The tip 1 of the steel pipe pile according to the present invention comprises a steel pipe pile 2.
Consists of a short pipe 11 attached to the tip of the. The short pipe 11 has the same diameter as the steel pipe pile 2. At least one or a plurality of excavation claws 13 projecting downward from the lower end surface and projecting outward from the lower end outer periphery are provided on the outer periphery of the lower end of the short pipe 11. An excavation blade may be provided at the lower end of the short pipe 11 in addition to the excavation claw 13. Alternatively, only the excavation blade 13 may be provided instead of the excavation claw 13. In addition, short pipe 11
A partition plate 12 is provided substantially in the middle in the vertical direction, and a lower end 14a projects from the outer peripheral surface of the short tube 11 with one or several turns of the spiral wing 14 starting from a position almost outside the partition plate 12. I will set it up. The tip fitting 1 thus formed is attached to the tip of the steel pipe pile 2. This attachment means is welding 3. The outer peripheral edge of the upper end of the short pipe 11 is chamfered 15, and the outer peripheral edge of the tip of the steel pipe pile 2 is also chamfered 21. By welding 3 between these chamfers, the tip fitting 1 is attached to the tip of the steel pipe pile 2.

FIGS. 2 and 3 are cross-sectional views of a main part showing another embodiment in which the tip fitting 1 is connected to the steel pipe pile 2. FIG.

In the embodiment shown in FIG. 2, the short pipe 11 of the tip fitting 1 connected to the tip of the steel pipe pile 2 and the upper end of the short pipe 11 and the tip of the steel pipe pile 2 The connecting inner cylinder 4 to be crossed is fitted. The connecting inner cylinder 4 and the short pipe 1
A bolt 5 is passed through the upper end of the bolt 1 and the tip of the steel pipe pile 2 respectively.
Screw in and tighten. By tightening the nut 6, the tip fitting 1 is connected to the tip of the steel pipe pile 2.

In this case, the upper end of the short pipe 11 of the tip fitting 1 and the tip of the steel pipe pile 2 may be connected by welding 3. That is, the connection of the welding 3 and the connection via the connection inner cylinder 4, the bolt 5, and the nut 6 may be used together.

FIG. 3 shows an embodiment in which the short pipe 11 of the tip fitting 1 connected to the tip of the steel pipe pile 2 and the upper end of the short pipe 11 and the tip of the steel pipe pile 2 Of the outer cylinder 41 for connection. Bolts 5 are passed through the upper end of the connecting outer cylinder 41, the upper end of the short pipe 11, and the tip of the steel pipe pile 2, respectively, and a nut 6 is screwed into the tip of the bolt 5 protruding and tightened. By tightening the nut 6, the tip fitting 1 is connected to the tip of the steel pipe pile 2.

In this case, the upper end of the short pipe 11 of the tip fitting 1 and the tip of the steel pipe pile 2 may be connected by welding 3. That is, the connection of the weld 3 and the connection via the connection outer cylinder 41, the bolt 5, and the nut 6 may be used together.

As described above, the steel pipe pile 2 to which the tip fitting 1 is attached is rotationally pressed into the ground using a rotating device (not shown). When rotating the steel pipe pile 2 into the ground,
When standing on the ground, the tip fitting 1
Approximately the lower half of the is penetrated into the ground. That is, the tip fitting 1
Is hollow from the lower end opening of the short pipe 11 to the partition plate 12, so that the lower half of the tip fitting 1 can easily penetrate into the ground. If holes 12a for venting air are formed in the partition plate 12, this penetration is easier.

[0016]

Since the space from the lower end opening of the short pipe to the middle partition plate is hollow, the tip fitting can easily penetrate the ground when the steel pipe pile is set on the ground. As described above, when the tip fitting is first penetrated into the ground, preparation for rotating and press-fitting the steel pipe pile is completed. That is, positioning for penetration can be easily performed. When the preparation is completed in this way, the steel pipe pile is rotationally pressed into the ground by a rotating device. Since the tip fitting has penetrated the ground in advance, this rotary press-fitting can be quickly performed at an accurate position. In addition, the support capacity of the steel pipe pile is large due to the presence of the partition plate.

Since the lower end of the spiral wing protruding from the outer peripheral surface of the short tube starts from a position almost outside the partition plate, there is no obstacle for penetration on the outer peripheral surface of the short tube below this position. , And can smoothly penetrate into the ground up to the partition plate.

[Brief description of the drawings]

FIG. 1 is a partially broken side view in which a tip fitting of a steel pipe pile of the present invention is connected to a tip of a steel pipe pile by welding.

FIG. 2 is a cross-sectional view of a main part showing another embodiment of a metal fitting for a steel pipe pile according to the present invention.

FIG. 3 is a cross-sectional view of a main part showing another embodiment of a tip fitting of a steel pipe pile according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip metal fitting 11 Short pipe 11a Lower end opening 12 Middle partition plate 12a Air vent hole 13 Drilling claw 14 Spiral wing 2 Steel pipe pile 3 Welding 4 Connection inner cylinder 41 Connection outer cylinder 5 Bolt 6 Nut

Claims (1)

[Claims] 1. A short-pipe end fitting connected to a tip of a steel pipe pile, wherein the short pipe of the tip fitting has the same diameter as the steel pipe pile,
At least one excavating claw is provided at the lower end of the short pipe so as to protrude downward from the lower end face and protrude outward from the outer periphery of the lower end. A metal pipe pile tip, characterized in that one or several spiral wings whose lower end starts from a position substantially outside the above-mentioned partition plate project from the outer peripheral surface of the short pipe.